+if ( get_option('db_upgraded') ) {
+ $wp_rewrite->flush_rules();
+ update_option( 'db_upgraded', false );
+
+ /**
+ * Runs on the next page load after successful upgrade
+ *
+ * @since 2.8
+ */
+ do_action('after_db_upgrade');
+} elseif ( get_option('db_version') != $wp_db_version ) {